Division stop mechanism fob



July 22, 1941. G. c. CHASE 2,250,403

DIVISION STOP MECHANISM FOR CALCULATORS Filed Aug. 17, 1927 9 Sheets-Sheet 1 @@@@aaQ@@@ cnmmumm? @mun@muw @mumwmx@ @mummmme- @mummmxw -@muwmwmw\ -emummmnm @mummmme mmnwmmme U INVENTOR XOLO *kil/Gbb ($611 L ATTORNiY July 22, 1941. .3, CHASE 2,250,403

' DIVISION STD? MECHANISM FOR CALCULATORS Filed Aug. 17, 192'? 9 sheets sheet 2 ATTORNEY 4 y 22, 1945 G1. (a. CHASE DIVE-SIGN STOP MECHANISM FOR CALCULATORS Filed Aug. 1'7, 1927 9 SheetsSheet.-3

Fia 5 INVENTOR 6 hwb ATTORNEY July 22, 1941. G. c. CHASE 2,250,403

DIVISION STOP MECHANISM FOR CALCULATO RS Filed Aug. 17, 1927 9 Sheets-Sheet 4 ATTORNEY July 22, 1941.- c CHASE 2,250,403

' DIVISION STOP MECQANISM FOR CALCULATORS Filed Aug. 17, 1927 9 Sheets-Sheet 5.

INVENTOR ATTORNEY July 22, 1941. Q Q CHASE 2,250,403

DIVISION STOP MECHANISM FOR CALCULATORS Filed Aug. 17, 1927 9 Sheets-Sheet 6 x302 2/7 Fla. 5

. 3M A w 1/4 t w 0 INVENTOR 40 @iI/GAL 660 CAAJm aw ATTORNEY July 22, 1941. G. c. CHASE 2,250,403

DIVISION STOP MECHANISM FOR CALCULATORS Filed Aug. 17, 1927 9 Sheets-SheetB Fig.1?"

INVENTOR ATTORNEY July 22, 1941. G. c. CHASE 2,250,403

DIVISION STOP MECHANISM FOR CALCULATORS Filed Aug. 17, 1927 9 Sheets-Sheet .9

I NVE NTOR A TTORNEY Patented July 22, 1941 UN TED STATE PATENT OFFICE DIVISION s'r'or MECHANISM son CALCULATORS George 0. Chase, South Orange, N. 1., assignor to I Monroe Calculating Orange, N. J., a corporation of Delaware Application August 17, 1927, Serial No. 213,637

17 Claims.

erating member, and whereby the operating means of the machine may be brought to rest at the conclusion of the quotient registration.

An object of the invention is the provision of means whereby a settable operating member, automatically restored from set position to terminate an operation with the numeral wheel carriage in extreme left-hand position, may be set with the carriage in such position to secure the registration of a quotient figure.

Another object is the provision of automatic division mechanism in a machine having'certain approved principles of operation and equipped with means for normalizing-the condition of the machine at the conclusion of an operation.

Other objects appear.

The invention consists in tion and combinations of parts, as set forth in the appended claims.

The present application is a continuation in part of application Serial No. 67,676, flied No- 'vember 7, 1925, which has resulted in Patent No.

issue No.-18,130. r In its preferred embodiment the present inven- 1,664,661, reissued on July 21, 1931, under the Retion is a development of the machine disclosed in U. a. Patent No.1,888,16'1,'of Geo. C. Chase, for Automatic control for calculating machines, issued November 15, 1932, and also contemplates the provision of means for combining therewith the devices forming the subject matter of U. S. Patent No. 1,664,681 of the same inventor, for Full cycle positioning mechanism, dated April 3, 1928. I

As stated in the specifications of these-appli-. cations, the machine has a reversible cycle of operation; that is to say, the phases of the cycle occur in reversed order when the operation is changed from positive or additive to negative or subtractive, so that the carry phase which follows the ordinal registration phase during one (say additive) operation will idly precede the ordinal phase in the otheror subtractive operation. In the accompanying drawings, illustrating the invention:

Fig. 1 is a plan view of the machine.

Fig. 2 is a sectional view taken on line 2-2 of Fig. 1.

the novel construcand advantages hereinafter Machine Company,

Fig. 3 is a sectional view taken on line 3-4 of Fig. 4 and showing the transmission.

Fig. 4 is a sectional view taken on line H of Fig. 3. e

Fig. 5 is a partial right side view of the machine with casing broken away. showing the driving gears, auxiliary locating cam and operating key mechanism.

Fig. 6 is a detail perspective view, showing the connection between the operating keys and clutch mechanism.

Fig. 7 is a left side view of the machine with the casing removed.

Fig. 8 is a left side view showing the parts,

controlling the starting and stopping of the machine in automatic division, in neutral position.

Fig. 9 is a view similar to Fig. 8, with parts in operative position.

Fig. 10 is a detail view showing the position "of parts not shown in Fig. 8.

Fig. 11 is a view similar to Fig. 16, looking from the reverse side. a

Fig. 12 is' a detail view showing parts not shown in Fig. 9.

,Fig. 13 is a top view showing the carriage 5m clutch mechanism, with parts in neutral padtion.

Fig. 14 is a view similar to Fig. 13, withcarriage shift clutch engaged.

Fig. 15 is a front view .of parts shown in 1'18. 14, showing the carriage shift cam in neutral position.

Fig. 16'is a view similar to Fig. 15, with the cam rotated 90' and the carriage advanced a half step to the left.

v Fig. 17 is a detail left side view, showing how an overcarry sets the machine for reverse movement.

extra-cyclic movement.

Fig. 19 is a similar view. showing add position.

Fig. 20 is a similar view, showing how the parts effecting .a carriage shift are actuated during the extra-cyclic movement in addition.

Fig. 18isasimilarvlew,showingthepartsin position assumed at the end of a subtractive the the stopping arm in its rebound throws the clutch into Fig. 23 is a. detail view, showing the reversing tooth latch lifted and the tooth retracted as the parts pass through full-cycle position before the final adding stroke.

Fig. 24 is a detail view, showing the lock lever held inoperative during the final adding stroke.

Fig. 25 is a detail view, showing the lock lever release during the final extra-cyclic movement.

Registering means-Jigs. 15

According to the present disclosure and as more fully set forth in the patents above referred to, amounts set up on the keyboard l8 and thereby upon the differential actuating gears 5 (Fig. 2) are registered positively or negatively upon numeral wheels l3 by the operation of differential gear shaft 4 and of shaft I54 whereon the ls carry members are mounted, these shafts being connected by a train of 1 to 1 ratio gearing It, IS, 80, 8| (Fig. 5). The numeral wheels I; and theusual quotient wheels 85 are mounted on a transversely shiftable carriage 2, which is displaced toward the left in the well-known manner in performing division operations.

The motordrivingmeans oomprisesamotor A in driving connection with a planetary gear mechanism, the gear members! and I09 of which normally rotate idly but may be selectively arrested by means of a reversing clutch lever Ill, fulcrumed at H2, to drive the third member of a differential, connected with carry shaft I54, forwardly or reversely, Thus when the forward end of lever ill is raised, a clutch tooth of rear arm N3 of said lever will engage clutch member III! of gear MS, to cause subtractive rotation of the numeral wheel actuators, and when the forward end of lever H i is depressed the clutch tooth of rearwardly extending arm II of the lever will engage a clutch tooth I01 of the gear l 05 to cause additive rotation of the numeral wheel actuators.

Division mechanism-Figs. 7 to 21 In order to render the operation of division automatic, that is to say, to terminate the successive negative registrations upon the numeral wheels I! at a point which will leave the proper quotient registration upon wheels 85, the following known method of operation is employed: The divisor set up on the keyboard I 8 is subtracted from the dividend registered on the numeral wheels i2 once more than the number of times said divisor is contained in the corresponding portion of thedividend, a negative numeral wheel reading being obtained and the carry over mechanism of the machine providing for the registration of a series of 9s upon numeral wheels I! as far to the left as such carry over mechanism is provided. In other words a transitional carry has occurred. This carry is utilized to reverse the actuating means, so that a single positive registration will occur, whereupon a second transitional carry will move the left hand numeral wheels from 9 to 0 registration, correcting the excessive subtraction and leaving the proper quotient registered on one of the wheels 85. This second transitional carry is utilized to shift carriage 2 to the left and to reverse the actuating means again so that subtractive operation will occur in the next quotient position.

The division key lever is made in two parts, a main portion 2M and a handle portion 3l8, mounted on a common fulcrum 202 of the framing and connected by pin and slot means I". Lever 20I carries at the lower end thereof pawl 3I9 pivoted at 205 and having spring 208 acting to hold the pawl in contact with stop 201. A click latch 22! engages a tooth 230 of lever 20! and under the influence of latch spring 228 serves to throw lever 20! rapidly into operating position after the latch has passed the point of said tooth, irrespective of any hesitation in the manipulation of handle SIB. The click latch 22! also holds the division lever 20! under spring tension either in retracted or in operative position. The forward arm of the reversing clutch lever III is provided at its free end with a cam tooth 208, with which pawl 9 contacts during the setting movement of the division key, to adjust said reversing clutch lever from neutral to subtracting position, as shown in Figure 9.

The machine having been started in operation will continue to run in a subtractive direction until a. transitional carry occurs, at which time the full cycle stop mechanism will operate to bring reversing clutch lever HI into neutral position as follows:

Crank arm 20, on shaft 4, has link connection 2! with rock lever 22. Arm 24 is pivoted at 2! and normally held in rearward position by spring 28, with a suitable lug thereof in contact with a stop pin on the frame, and carries pivotal stop element 25, located in the plane of and normally held outside the path of movement of rock lever 22, against the tension of its spring 28, by the action of spring 28 and engagement of lug ll! of element 25 with the end of a compound trigger lever 31. When a transitional carry occurs the carry pin q of the highest order numeral wheel to receive the carry impulse will contact with cam end 32 of trigger lever II and raise the forward end of said lever out of contact with stop element 25, the latter, actuated by its spring, dropping into position to engage the free end 21 of the rock lever 22 upon the next forward stroke thereof (Fig. 17). Arm 2 will now move as a unit with rock lever 22, a rearward extension I of said arm engaging by'means of a pin I 5 thereof with one of the opposite cam walls I 41 of reversing clutch lever III to bring the latter to neutral or unclutched position (Fig. 18).

Following the action of arm 24 upon lever III, continued movement of lever 22 and arm 24 will bring lug 24' of the latter into engagement with the stop 29, whereby forward movement of the parts will be arrested beyond the full cycle position and spring 28 will be tensioned. During the rebound of the parts reversing clutch lever II I will be moved from neutral to additive position by the following means:

A pivoted, slidably adjustable tooth 209 is carried upon the forward arm of reversing clutch lever III, by means of lateral stud 2 of said tooth engaging slot 2| l of the lever, and fulcrum stud H2 of'the lever engaging slot H2 of the tooth. A spring 2) tends to retract tooth 2". Stud 2 engages arcuate edge N2 of division lever 20!, this engagement serving upon movement of said lever to operating position to move tooth 209 forwardly. Upon the side of reversing clutch lever Ill opposite tooth 209 is provided a pawl M3 the free end of which is extended to overlie the stud 2| l, spring 214 acting to maintain engagement of the pawl with said stud as shown in Fig. 11. Pawl 2| 3 is provided at its free end with a notch 2i 5, shoulder 2| I of which enters into engagement with stud 2| I when tooth 209 is moved forwardly by the division lever,

thereby locking tooth 209 in forward position as shown in Fig. 12.

Reversing clutch lever Ill having been restored to neutral position, the rebound of the mechanism referred to will cause the tooth 21b of link 26 of the stop mechanism to sweep downward and engage the forward end of the projecting tooth 209, acting thereupon to move the reversing clutch lever into additive position as shown in Fig. 19. Similarly, upon the operation of the transitional carry at the end of an additive rotation, arm 29, passing through its normal dead center position on the rebound, tooth of link 2i will sweep upward as shown in Figure 12, engaging tooth 269 and moving the reversing clutch lever into subtractive position.

For the purpose of shifting the'carriage, shaft t8, provided with the opposite crank pins 64 engaging the serrations of a rack located on the lorward edge oi the carriage, is rotated by power derived from the motor A, transmitted through the operation of arm 2% or" the full cycle stop mechanism following an additive registration.

Push rod ll is pivoted on arm 2% at all, and has a rear cam face it engaging pin 50 mounted upon link 2i, the forward end of said push rod being adapted to push forwardly against roller 5i mounted on bell lever 52. Lever 52 is fulcrumed at 53 to the framing and at its forward end is connected with an arm of carriage shifting lever 55 by means of spring El and-spacer rod 5 3. Coiled spring 5? is secured at one end to lever 52 and at its opposite end to lever 55, and spacer rod 5t is located within the coils of said spring and held thereby with its ends normally in con tact with the respective levers.

The other or right hand arm of carriage'shifting lever 55 is provided at its free end with a roller 58, adapted to operate against carriage shifting cam 60, loosely mounted on shaft 46 and having a toothed hub clutch member 6!, adapted for engagement with the teeth of the complementary opposed clutch member 63, fast upon shaft 46. A coiled spring 3H3, acting through a pivoted plate 65 provided with a shipper arm 3W engaging the hub of cam 66, tends to press said about one half of its step movement to the left. The momentum'o! the carriage and the force of gravity acting thereon is sumcient to complete its one step of movement. I

Upon the conclusion of subtractive operations push rod Al, moving with arm 24 will be allowed to slide at its forward end under the roller It on bell. lever 52 and will not actuate the other shifting devices. This is due to the position taken by link 26 upon conclusion of subtractive operations, this position being upon the opposite side of dead center and higher than the position taken upon conclusion of additive operations (see Fig. 18), whereby the rear end of the push rod is permitted to rise and its forward end to slide under roller 56 as stated.

The division key is adapted for retraction to normal position at any time during the divisional operation of the machine. to permit the retrac tion of tooth 269. It is evident when tooth 269 is retracted a transitional carry will operate to stop the machine, rather than to reverse the clutch lever in a return movement of the divi- Y sion key.

cam rearwardly, toward clutch member .63, the

cam being however held with its toothed hub out of engagement with the complementary clutch member when the division key is retracted by means of lever 3M engaging plate 65 and mounted upon a slide rod 2i! engaging a pin 302 on the division. lever handle member SIG; (Fig; 13). Lever GM is held in position by means of a suitable stop pin thereof engaging rod 23?. When the division key is moved to operating position, resistance through the parts 2H, 30! and 65 being removed, spring 3l6 will be free to eifect the clutch 0 members SI and 63, as shown in Fig. 14.

During the movement of arm 24 of the full cycle stopmechanism from normal position to position against stop 29 at the end oi! the corrective additive operation, pin of link 2! encounters cam end 49 oi the push rod and thereby holds the forward end of said rod against roller in forward position.

'Ilio,,division key lever is provided with a pin M9, normally underlying the lower edge of pawl 2 I3 and so disposed that in the movement oi the division key from normal to operating position pawl 2E3 may drop and bring the shoulder did of its notch 2H into engagement with stud Mi of slidable tooth 209, thereby locking said tooth When reversing clutch lever Iii is moved to adding position, pawl 2m moves downwardly therewith, but if the division key is in normal position pin m thereof will engage the lower edge of pawl 2i? and lift said pawl from engagement with stud til, whereupon slidable tooth 209 will be at once retracted by its spring, out of the path of cam tooth 2W of link 2i, so that lever ill will not be thrown out of neutral position and the motor will remain out of driving connection with the actuators.

When division key 2M is in operative position pawl 2 l3 locks the slldable tooth 209 in projected position and pin 2l9 is located beneath the free end portion of pawl 2I3. If the retraction of the division key is accomplished during the time that the reversing clutch lever I H is standing in its additive position, a cam tooth 222 of pawl 2 is engaged by pin 2| 9 and the pawl is thereby raised from its locking position and slldable tooth 209 is immediately released, so that the operation will be stopped as the parts next pass through full cycle position (see Fig. 23).

Full cycle locatm' mechanism-Figs. 8, 9, 21-25 The operations so far described are performed by mechanism very similar to that disclosed in the patents hereinbefore referred to. According to the present invention, these devices are adapted for use with the full cycle positioning or locator mechanism of the Chase Patent No. 1,664,661, so that at the end of an operation the released actuating means will be brought to rest and looked as follows:

Lock lever 200 is fulcrumed to the framing at l9! and is adapted under the influence of spring 203 to engage the forward end of link 2i when crank arm 20 is in rearward dead center position, said position corresponding to the full cycle position of the actuating mechanism. When the division key is moved to operative position, lock lever 200 is raised out of engagement with link 2% and held in disengaged position by means of latch lever 303, having a cam portion 304 engaged by pin 205 of division key lever 20L When the division key is retracted, latch lever 303 will be held in latching position by means of spring 306 acting upon an arm 301 pivoted to lever 303, said arm having a click tooth engaging a pin of the framing which, by opposing longitudinal movement of arm 301, will resist pivotal movement of lever 303. Upon the operation of the full cycle stopping and reversing means, pin I45 in the extension of arm 24 will be brought upwardly against 9. lug 308 of arm 30'! and will raise the free end of said arm, against the tension of spring 306. When this action occurs in the reversal of the actuators a cam tooth 309 of arm 30'! will be brought in rear of a pin 3H3 in slidable tooth 209, the only eilfect of the movement at such time being to insure the retention of latch lever 303 in engagement with lever 200 (Fig. 22). When the movement occurs at the end of a calculation, slidable tooth 209 being retracted, the cam face of tooth 308 will be brought in contact with pin 3I0, so that arm 30! in rising will be moved endwise to shift latch lever 303 out of latching engagement, and lock lever 200 will fall upon link 2I and will drop into locking engagement with the end of the link astheparts come to full cycle position (Fig. 25). It is to be noted that the operation of arm 24 will also serve to trip latch 204, used in connection with the add and subtract keys I20, I2 I to hold lock lever 200 in raised position. It is also to be noted that latch 204 relieves the latch arm 30'! from the force of spring 203, except during the reversal Means for automatically terminating a divisional OPCTGtiW-FiQ-S. 8, 9, 21

Means are provided for'terminating a divisional operation/when a quotient figure has been registered in the extreme right hand wheel 85 (that is to say, with the carriage 2 in extreme left-hand position), and according to the present invention this means is adapted to permit the division lever to be set to operative position with the carriage in said extreme position, so that a quotient figure may be registered under this condition.

It will be recalled that upon retraction of the division lever the operation will continue until the initiated quotient figure registration has been completed, and the automatic stop means employed comprise devices set by the carriage in of the actuators, when arm 30'! is looked, as

above described.

In bringing the actuating means to rest spring 28 and stop 29 have exercised a retarding action, and in order further to cushion the stop, spring means are provided whereby a slight yielding of the engaging portion of lever 200 is permitted under the impact of link 2I. For this purpose lock lever 200 is provided with a slide extension 228, having an end lug located beyond the free end of said lock lever and normally held spaced therefrom by spring 23L Contact of link 2| is made with the end lug of extension 220, and movement of said link, with-the actuating mechanism, is resisted by spring 23I which will also return the slide extension to normal position. The cushioning movement is limited by engagement of lug 232 with the end of lever 200. A locator cam I53 and spring arm I55 also serve to centralize the actuating mechanism (Fig. 5).

It is to be noted that lock lever 200 must be held inoperative during automatic reversal of the actuators and during carriage shifting because said lever forms part of the normalizing mechanism for bringing the various parts of the machine to rest. Obviously, therefore, the abovedescribed means, whereby lever 200 is so held, might be used with equal effect in connection with other normalizing mechanism, such as the circuit breaker shown in the Rinsche Patent No.

entering extreme left-hand position and operated during the subtractive rotation of the actuators to retract the division lever.

For this purpose a push rod 3I I is pivoted upon the framing by engagement of a horizontal'slot of said rod with a pin 224 of the framing, the forward end of the rod having a vertical slot engaging a pin 3I2 of division lever handle 3I8. Push rod 3I I is normally held by spring 305 with a rearward lug 3I3 thereof out of the path of movement of a tooth 3I4 forming an extension of shaft 4 opposite to crank extension 20 (Fig. 8). A lever 223 is fulcrumed intermediately of its length upon the pin 224, a lug 3I5 upon the forward arm of said lever lying beneath .push rod 3i I, and the rear arm of the lever lying in the path of movement of a lug I98 of the carriage 2, as said carriage comes to extreme left-hand position.

When division lever handle 3I8 is set to operative position push rod 3 slides rearwardly therewith, but unless the numeral wheel carriage is then in extreme left-hand position lug 3I3 will remain out of the path of movement of rotating tooth 3I4 (Fig. 9). With the numeral wheel carriage in extreme left-hand position, however, lug I98 of the carriage, resting upon lever 223 holds said lever and rod III rocked about fulcrum 224, in position to bring lug H3 into the path of rotation of tooth 3| 4 when the division lever is set to operative position. Thus upon rotation of shaft 4, rod ll I, handle 3I0 and division lever 20I will be forced into retracted or inoperative position, the operation of latch 225 serving to move lug 3I3 fully out of contact with tooth 3I4. Upon the next shifting movement of the carriage, lever 22! is released,'and spring 305 will bring the partsback to normal position.

I claim: 7

1. In a calculating machine having a transversely shiftable carriage, numeral wheels there on, differential value actuators for said numeral wheels, and selecting mechanism, means for dividing an amount registered upon said numeral wheels by an amount set up in said selecting mechanism and for automatically registering a plural figure quotient, including a member settablc to initiate the operation, carriage shifting devices, means for stopping the actuators in full cycle position upon completion of aninitiated quotient figure registration following retraction of the settable member, and means for retracting said member during the operative cycle of the actuators.

wheels, and selecting mechanism, means for dividing an amount registered upon said numeral wheels by an amount set up in said selecting mechanism and for automatically registering a plural figure quotient, including a member settable to initiate the operation, carriage shiftinc devices, normally inactive means for retracting the settable member by an impulse transmitted to said actuators, and means for placing the parts of the retracting means in active relation upon movement of said carriage to extreme left hand position.

3. In a calculating machine having a transversely shiftable carriage, numeral wheels thereon, differential value actuators for said numeral wheels, and selecting mechanism, means for dividing an amount registered upon said numeral wheels by an amount set up in said; selecting mechanism and for automatically registering a plural figure quotient, including a member settable to initiate the operation, carriage shifting devices, and means for retracting the settable member including an element associated with said settable member and adjustable independently thereof, a contact element movable with said actuators, and means operable when the carriage is in extreme left hand position to adjust said associated element into the path of movement of said contact element.

4. In a calculating machine having a transversely shiftable carriage, numeral wheels thereon, differential value actuators for said numeral wheels, and selecting mechanism, means, for dividing an amount registered upon said numeral wheels by an amount set up in said selecting mechanism and for automatically registering a plural figure quotient, including a member settable to initiate the operation, carriage shifting devices, and means for retracting the settable member including a push rod movable with said settable member and adjustable independently thereof, a contact element movable with said actuators, and a lever operable when the carriage is in extreme left hand position to adjust said push rod into the path of said contact element,

ii. In a calculating machine having a transversely shiftable carriage, numeral wheels thereon, differential value actuators for said numeral wheels, and selecting mechanism, means for dividing an amount registered upon said numeral wheels by-an amount set up in said selecting mechanism and for automaticallyregistering a plural figure quotient, including means whereby said carriage will be shifted by an impulse transmitted through said actuators, and means for retraction of said manipulable member, means for locking said actuators in full cycle position, and means operable by the manipulable member to release the locking means and latch the same in inoperative position and operable by means cooperating with the settable member in its retracted position to unlatch the locking means.

' for disengaging the clutch, means for reeng'a '7. In a calculating machine having numeral wheels, differential value actuators therefor, a motor, clutch means between said motor and said actuating mechanism, and selecting mechanism, means for dividing an amount registered upon said numeral wheels by an amount set up in said selecting mechanism and for automatically registering a plural figure quotient, including mea said clutch, means for disabling the reengaging means, means for locking the disengaged a ators in full cycle position, and means op ble to latch the locking means in inoperative positlon, the clutch disengaging means coopera with the disabled reengaging means to unlatcn the locking means. a

8. In a calculating machine having runneral wheels, reversible actuators therefor, motor, and motor operation control devices for said actuators including means for interrupting an operation, and devices normally operabale upon ar tuation of the interrupting means to bring the machine into normal condition or rest; means for modifying the action of said interrupting means to reverse the direction of rotation of the act-ir ators, and means for preventing operation. of normal condition devices in the modified action of the interrupting means.

9. In a calculating machine having a trans versely shiftable carriage, numeral wheels there- 'on, actuating mechanism for said wheels having a reversible cycle of operation, and selecting mechanism; means for dividing an amount registered upon said numeral wheels by an amount set up in said selecting mechanism and for auto matically registering a plural figure quotient, in cluding means for automatically shifting said carriage, means for locking saidactuating mechanism in full cycle position upon completion of the registration, and means for holding the loci: inactive during said shifting.

' 10. In a calculating machine having a transversely shiftable carriage, numeral wheels there on, and selecting mechanism; means for dividing: an amount registered upon said numeral wheels by an amount set up in said selecting mechanism and for automatically registering a plural figure quotient, including a member settable to initiate the operation, automatic carriage shifting de vices settable by said member, normally inactive means operable during a registration to disable said shifting devices, and means'for' rendering" the disabling means active upon movement oi the carriage to extreme left hand registering position,

11. In a calculating machine, a calculating mechanism normally locked against operation,

means for controlling operation of said calcu-' lating mechanism including a plurality of gears constantly enmeshed and a selectively operable engaging means therefor, means for unlocking said calculating mechanism and selectively oper ating said engaging means to initiate an operation, and means for maintaining said calculating mechanism unlocked and operating said engaging means to terminate the initial operation and initiate a different operation.

12. In a calculating machine, a calculatin mechanism having a cyclic mode of operation, means for positioning said calculating mechanism, in full cycle position comprising an obstructing means adapted to be maintained in obstructing position as long as said calculating mechanism is at rest in full cycle position, means for continuing the cyclic movement of the calculating mechanism in a direction opposite to the original direction and to restrain said obstructing means from obstructing position.

13. Inc. calculating machine, a calculating mechanism having a cyclic mode of operation, means operable in full cycle position of said calculating mechanism for reversing said calculating mechanism, means operable in full cycle position of said calculating mechanism for looking said calculating mechanism against cyclic movement, means or disabling said locking means to permit continued cyclic movement of said calculating mechanism, and means for automatically operating said reversing means during cyclic movement of said calculating mechanism rendered effective as an incident to the operation of said disabling means.

14. In a calculating machine, a. calculating mechanism having a cyclic movement, means for locking said calculating mechanism against cyclic movement, means for initiating subtractive operation of said calculating mechanism, means for disabling said locking means to permit continued cyclic movement of said calculating mechanism, and automatically operating means enabled by said disabling means for terminating subtractive operation and initiating additive operation.

15. In a calculating machine, calculating mechanism, a driving control and transmission mech anism for initiating, maintaining, and terminating the operation of said calculating mechanism 3 and for determining the direction of operation of said calculating mechanism, in combination with means normally operating to lock said calculating mechanism in stopping position, rendered inoperative by said driving control and transmission mechanism when said mechanism operates to reverse and maintain the operation of the calculating mechanism.

16. In a calculating machine, a reversible actuator, means for controlling the actuator for continuous operation through a plurality 01 cycles including a reversal means normally operative in full cycle position to lock the actuator against cyclic movement, and means operated as an incident to the operation of said controlling means for retaining said locking means in inoperative position.

17 In a calculating machine, a reversible rotary actuator, a drive shaft for said actuator, a clutching and reversing transmission mechanism interposed between said drive shaft and actuator, including a pivoted member having a shoulder thereon adapted to hold the actuator against cyclic movement when said shoulder abuts. a second shoulder or abutment, control meansior all of said mechanism including reversing means operable to reverse direction of the actuator and means operable by said control means to hold the locking means ineffective during reversing operation.

l GEORGE C. CHASE. 

